intra-rustdoc-links: fails for re-exported module docs

[ehuss]

The links at https://doc.rust-lang.org/nightly/std/cmp/index.html are not rendering, but they work correctly on the core page (https://doc.rust-lang.org/nightly/core/cmp/index.html).

Same with https://doc.rust-lang.org/nightly/std/str/pattern/index.html vs https://doc.rust-lang.org/nightly/std/core/pattern/index.html

[jhpratt]

Any updates on this issue? I'm running into it now, and there's no trivial workaround if the module isn't also public.

[Manishearth]

Filed #65983 with more information on this so someone can pick it up if they want to